From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=95.215.58.220 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793421194; b=Fi/MnrNq3/DIPblnRSDlUcIlE1BmjwixYnrtMf4QlCXHSquZEoWou9vtxOwRPsXm01IZ AvheWU0G/Z7sc/TGuggqrQzIMVXxzRn3NdFFZhu3ciFewGFgsPEu/PK2xIuH+MnvbBk7X eyAK406Jc07BK6hCnu9+cYDKXi/dtlq/6+aE1llcAof0O/luV3J6mXK9pO6azHyPJour2 mtDGue0KJd0HnWDnTV3zJutHFGv+e6pWnykEkqrG0R15ymEgzXStX63e+ee6b94d8E75D fjdIBqvq63IDMghjtcFsYDVYvH29t0gaeER2g8uN5u/N6CH7U3sAQo1BAjLhz8U2XDQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793421194; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:Date:From:To:Cc:Subject:Message-ID: References:MIME-Version:Content-Type:Content-Disposition:In-Reply-To; bh=tArUjAi7RyNIs44mDcDEd1/onmpGhyZQLsYyXwL8Y3g=; b=q93U5r7RM4kXG62xCDPjYVv7wFLYLRmzxKO5Q18YmMq6cDHqcLh1RXIsWOPpPCTcBta0 1Vnz7Wc1MC1Ar7ClsSWbZD7DZgFGTLKPzQT+ag1D1Bx5kCv3NfIf/i1r2oNsCogZZRq5p 38PCETzxxLzdGvBeYd5Q/pUiLI4IQfZyI0vs3AbcQxD+0dsf7k1WSfc22y0aZ7jp67E4u JEqUsLuSkd072CMV6BsTgmlCdcFLVjIHELlBMAYBHNAv9nTWSNRjk8mqg1pVyLbUWxqvm wgxvm41NaOzk9unxBOmKqT1lAPLoj4ToUhhLy4RY3xUIj99UQuDfcStIxJllyUN5R4w== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=WOpYCKsG; arc=none smtp.remote-ip=95.215.58.220 Received: from mta1.migadu.com (out-220.mta1.migadu.com [95.215.58.220]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B0EB6606A31A for ; Sat, 31 Oct 2026 04:33:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org B0EB6606A31A Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=WOpYCKsG X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=tArUjAi7RyNIs44mDcDEd1/onmpGhyZQLsYyXwL8Y3g=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1793421190; v=1; x=1794025990; b=WOpYCKsGnPscv077a/P4k2fR3lPgouuI+BzM+t/LdCmOSmvzoxrN6BHTRM5GHtAheLl6VqR5 5kpihFHNEoZQW5tqjixUpNOiMYVYKK2sUBoaaAZL45eKH4ldTR53gs5YB+BaJ5qqFKmnmLZE1o/ tLqWAqPKTqoad2/KCk1KcPK0= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id ea78379c5260a3be; Sat, 31 Oct 2026 04:33:09 +0000 X-Mizu-Trace-ID: ea78379c5260a3be X-Migadu-Flow: FLOW_OUT Date: Sat, 31 Oct 2026 04:33:06 +0000 From: Jose Fernandez To: "David Hildenbrand (Arm)" Cc: "Matthew Wilcox (Oracle)" , Jan Kara , Andrew Morton , linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Krystian Kaniewski Subject: Re: [PATCH] mm/filemap: stop fault-around when the walk steps back Message-ID: <20261031-jf-mm-filemap-reply-r2-7d4c1e9ab350@linux.dev> References: <20261028-jf-mm-filemap-map-pages-lower-bound-v1-1-0bf126e876d4@linux.dev> <0a1ad7d2-ff0e-4248-8f03-2a64a9134aae@kernel.org> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0a1ad7d2-ff0e-4248-8f03-2a64a9134aae@kernel.org> On Thu, Oct 29, 2026 David Hildenbrand (Arm) wrote: > Only read or also write? I assume only read. Both. KASAN only reports the read, but once vmf->pte has stepped outside the page table the loop will also call set_pte_range() on that slot if it reads as pte_none(), so a stray write is possible too. I'll call that out in the v2 changelog. > Sounds like we want a Fixes: tag and Cc: stable? :) Yes, v2 will carry both. - Jose